Head mask for laboratory animals



FIG. 1 is a top view of a head mask for laboratory animals showing our new design;

FIG. 2 is a top side view;

FIG. 3. is a right side view thereof;

FIG. 4 is a bottom side view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is bottom view thereof; and,

FIG. 7 is a front perspective view thereof. 

The ornamental design for a head mask for laboratory animals, as shown and described. 